Southwest Ohio sees first high-pollen day of 2021

High pollen levels were mostly driven by cedar and juniper trees, which contributed 774 grains per cubic meter, followed by less than 100 grains from maple trees and other trees, especially elm and birch.

These levels put us far above the 10-year average for March 8-12. For March 10, the 10-year average was 146 grains per cubic meter.

During pollen and mold season, the Southwest Ohio Air Quality Agency said it measures the daily levels of pollen and mold.